Costco shoppers have discovered that the retailer has changed its iconic $1.50 hot dog combo. Since 1985, the wholesale club has offered a 20-ounce refillable fountain drink and a quarter-pound beef hot dog for less than two dollars . The price of the meal, sold in Costco food courts, has remained unchanged for the last 40 years. However, shoppers have realized that they can now make a slight modification to their order. According to a Reddit post shared by a Costco member in Virginia, customers can pair their hot dog with a 16.9-ounce bottle of Kirkland Signature water, instead of a soda. In the comments, Costco members in Nevada and California said that they also noticed the change to the offer in their stores. It’s not clear if and when all U.S. locations will include the bottled water as an option. The Independent has contacted Costco for comment.…